Common Names: Myrtle Warbler, yellow-rumped warbler, butter butt
Sub-category: Wood Warblers
These birds are insectivorous, but will readily take wax-myrtle berries in winter, a habit which gives the species its name. Experienced birders recognize Myrtle Warblers with the naked eye by their flycatcher-like habit of making short circling flights from their perch in search of bugs. They form small flocks on migration or in winter.
In total length, the species can range from 12 to 15 cm long, with a wingspan of 19 to 24 cm. In summers, males of both forms have streaked backs of black on slate blue, white wing patches, a streaked breast, and conspicuous yellow patches on the crown, flank, and rump. The myrtle warbler has a white throat and eye stripe, and a contrasting black cheek patch. Females of both forms are more dull, with brown streaking front and back, but still have noticeable yellow rumps.
Yellow-rumped warblers spend the breeding season in mature coniferous and mixed coniferous-deciduous woodlands (such as in patches of aspen, birch, or willow).